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Meghna Thapar 5 years, 6 months ago
Demonetization is the act of stripping a currency unit of its status as legal tender. ... Sometimes, a country completely replaces the old currency with new currency. The opposite of demonetization is remonetization, in which a form of payment is restored as legal tender. Demonetization was initiated with a wide array of motives like stripping the Indian economy of its black money, push people to pay taxes for the unaccounted pile of cash, curb terrorism, promote the digital India movement and make India a cashless economy.
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Gaurav Seth 5 years, 6 months ago
- F-block elements: Elements in which the last electron entre any one of the seven f-orbitals of their respective ante-penultimate shells are called f-block elements.
General outer shells electronic configuration of f-block elements –
(n – 2) f0-14 (n – 1) d0-2 ns2
General Characteristics of f-block elements
- They have generally high melting and boiling points
- They show variable oxidation states
- Their compounds are generally coloured
- They have heavy metals
- They have a high tendency to form complexes.
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Lucifer?? Morningstar?? 5 years, 6 months ago
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Meghna Thapar 5 years, 6 months ago
The orbitals with the value l= 1 are the p orbitals which contain a nodal plane including the nucleus hence forming a dumbbell shape. The orbitals with l= 2 are the d orbitals which have complex shapes with at least two nodal surfaces. The orbitals with l= 3 are called the f orbitals that are more complex. d orbitals are wavefunctions with ℓ = 2. They have an even more complex angular distribution than the p orbitals. For most of them it is a "clover leaf" distribution (something like 2 dumbbells in a plane). dorbitals have two angular nodes (two angles at which the probability of electron is always zero. An orbital is a wave function for an electron defined by the three quantum numbers, n, ℓ and ml. Orbitals define regions in space where you are likely to find electrons. ... p orbitals (ℓ = 1) are dumb-bell shaped. The three possible p orbitals are always perpendicular to each other.
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Yogita Ingle 5 years, 6 months ago
Avogadro's work was brought to light after his death, by Cannizzaro .
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Yogita Ingle 5 years, 7 months ago
- Any uncertainty resulting from measurement by a measuring instrument is called error. They can be systematic or random.
- Accuracy of a measurement is how close the measured value is to the true value.
- Precision is the resolutionor closeness of a series of measurements of a same quantity under similar conditions.
- If the true value of a certain length is 3.678 cm and two instruments with different resolutions, up to 1 (less precise) and 2 (more precise) decimal places respectively, are used. If first measures the length as 3.5 and the second as 3.38 then the first has more accuracy but less precision while the second has less accuracy and more precision.
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Yogita Ingle 5 years, 7 months ago
The SN2 reaction is a nucleophilic substitution reaction where a bond is broken and another is formed synchronously. Two reacting species are involved in the rate determining step of the reaction. The term ‘SN2’ stands for – Substitution Nucleophilic Bimolecular. This type of reaction is also referred to as bimolecular nucleophilic substitution, associative substitution, and interchange mechanism.
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Meghna Thapar 5 years, 7 months ago
Atoms exist in free states in the form of molecule. ... Molecules may be formed by the combination of atoms of two or more different elements. For example molecule of water. It is formed by the combination of two atoms of hydrogen and one atom of oxygen. Atoms are not able to exist independently. All the elements on the far right side of the periodic table (inert or noble gas) atoms can exist independently because they all fulfil the octet rule. They do not need bond to become stable. ... A molecule is comprised of two or more chemically bonded atoms. It is estimated that there are between10^78 to 10^82 atoms in the known, observable universe. In layman's terms, that works out to between ten quadrillion vigintillion and one-hundred thousand quadrillion vigintillion atoms.
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Meghna Thapar 5 years, 7 months ago
A suspension is a heterogeneous mixture in which solute-like particles settle out of a solvent-like phase sometime after their introduction. We apply the word 'suspension' when particles are big enough to eventually settle. If the particles are too small to ever settle, they are said to form a colloid. Common examples of suspension include the mixture of chalk and water, muddy water, the mixture of flour and water, a mixture of dust particles and air, fog, milk of magnesia, etc.
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